43 lines
1.3 KiB
Diff
43 lines
1.3 KiB
Diff
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From d1216c052bedbf6d79e4b0261e2f09e17c66ffd3 Mon Sep 17 00:00:00 2001
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From: Dhananjay Ugwekar <Dhananjay.Ugwekar@amd.com>
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Date: Fri, 4 Oct 2024 12:23:04 +0000
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Subject: cpufreq/amd-pstate: Fix amd_pstate mode switch on shared memory
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systems
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While switching the driver mode between active and passive, Collaborative
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Processor Performance Control (CPPC) is disabled in
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amd_pstate_unregister_driver(). But, it is not enabled back while registering
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the new driver (passive or active). This leads to the new driver mode not
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working correctly, so enable it back in amd_pstate_register_driver().
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Fixes: 3ca7bc818d8c ("cpufreq: amd-pstate: Add guided mode control support via sysfs")
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Signed-off-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@amd.com>
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---
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drivers/cpufreq/amd-pstate.c | 10 ++++++++++
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1 file changed, 10 insertions(+)
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--- a/drivers/cpufreq/amd-pstate.c
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+++ b/drivers/cpufreq/amd-pstate.c
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@@ -1221,11 +1221,21 @@ static int amd_pstate_register_driver(in
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return -EINVAL;
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cppc_state = mode;
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+
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+ ret = amd_pstate_enable(true);
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+ if (ret) {
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+ pr_err("failed to enable cppc during amd-pstate driver registration, return %d\n",
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+ ret);
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+ amd_pstate_driver_cleanup();
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+ return ret;
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+ }
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+
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ret = cpufreq_register_driver(current_pstate_driver);
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if (ret) {
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amd_pstate_driver_cleanup();
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return ret;
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}
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+
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return 0;
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}
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